/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/HierarchyEditor/NiagaraHierarchyViewModelBase.h
Should return true if an item should be draggable. An uneditable item can not be dragged even if CanDragInternal returns true.
[FCanPerformActionResults](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\FNiagaraHierarch-_6\FCanPerformActio-) CanDrag()